616
6. PROTECTIVE FUNCTIONS
6.6 Check first when you have a trouble
6.6.5 Motor rotates in the opposite direction
6.6.6 Speed greatly differs from the setting
6.6.7 Acceleration/deceleration is not smooth
Check
point
Possible cause Countermeasure
Refer to
page
Main
circuit
The phase sequence of output terminals U, V
and W is incorrect.
Connect the output side terminals (terminals U, V, and W)
correctly.
50
Input
signal
The start signals (STF and STR signals) are
connected improperly.
Check the connection. (STF: forward rotation, STR: reverse
rotation)
60, 563
The polarity of the frequency command is
negative during the polarity reversible
operation set by Pr.73 Analog input
selection.
Check the polarity of the frequency command. 349
Check
point
Possible cause Countermeasure
Refer to
page
Input
signal
The frequency setting signal is incorrect. Measure the input signal level. —
The input signal lines are affected by
external EMI.
Take countermeasures against EMI, such as using shielded wires
for input signal lines.
93
Parameter
setting
Pr.1 Maximum frequency, Pr.2 Minimum
frequency, Pr.18 High speed maximum
frequency, and the calibration parameter
C2 to C7 settings are not appropriate.
Check the settings of Pr.1, Pr.2, and Pr.18. 287
Check the calibration parameter C2 to C7 settings. 357
Pr.31 to Pr.36, and Pr.552 (frequency
jump) settings are not appropriate.
Narrow down the range of frequency jump. 289
Load
Stall prevention function is activated due to
a heavy load.
Reduce the load weight. —
Parameter
setting
Set Pr.22 Stall prevention operation level higher according to the
load. (If Pr.22 is set too high, an overcurrent trip (E.OC[]) is likely to
occur.)
290
Motor Check the capacities of the inverter and the motor. —
Check
point
Possible cause Countermeasure
Refer to
page
Parameter
setting
The acceleration/deceleration time is too
short.
Increase the acceleration/deceleration time. 228
The torque boost (Pr.0, Pr.46) setting is not
appropriate under V/F control, so the stall
prevention function is activated.
Increase/decrease the Pr.0 Torque boost setting value by 0.5%
increments so that stall prevention does not occur.
551
The base frequency does not match the
motor characteristics.
Under V/F control, set Pr.3 Base frequency and Pr.47 Second V/
F (base frequency).
552
Under Advanced magnetic flux vector control or PM motor control,
set Pr.84 Rated motor frequency.
177
Regeneration avoidance operation is
performed.
If the frequency becomes unstable during regeneration avoidance
operation, decrease the setting of Pr.886 Regeneration
avoidance voltage gain.
572
Load
Stall prevention function is activated due to a
heavy load.
Reduce the load weight. —
Parameter
setting
Set Pr.22 Stall prevention operation level higher according to the
load. (If Pr.22 is set too high, an overcurrent trip (E.OC[]) is likely to
occur.)
290
Motor Check the capacities of the inverter and the motor. —
Downloaded from ManualsNet.com search engine
To Next Page
Loading...
Need help?
General
